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<title>MN10300 Options (Using the GNU Compiler Collection (GCC))</title>

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<h4 class="subsection" id="MN10300-Options-1"><span>3.19.30 MN10300 Options<a class="copiable-link" href="#MN10300-Options-1"> &para;</a></span></h4>
<a class="index-entry-id" id="index-MN10300-options"></a>

<p>These <samp class="option">-m</samp> options are defined for Matsushita MN10300 architectures:
</p>
<dl class="table">
<dt><a id="index-mmult_002dbug"></a><span><code class="code">-mmult-bug</code><a class="copiable-link" href="#index-mmult_002dbug"> &para;</a></span></dt>
<dd><p>Generate code to avoid bugs in the multiply instructions for the MN10300
processors.  This is the default.
</p>
</dd>
<dt><a id="index-mno_002dmult_002dbug"></a><span><code class="code">-mno-mult-bug</code><a class="copiable-link" href="#index-mno_002dmult_002dbug"> &para;</a></span></dt>
<dd><p>Do not generate code to avoid bugs in the multiply instructions for the
MN10300 processors.
</p>
</dd>
<dt><a id="index-mam33"></a><span><code class="code">-mam33</code><a class="copiable-link" href="#index-mam33"> &para;</a></span></dt>
<dd><p>Generate code using features specific to the AM33 processor.
</p>
</dd>
<dt><a id="index-mno_002dam33"></a><span><code class="code">-mno-am33</code><a class="copiable-link" href="#index-mno_002dam33"> &para;</a></span></dt>
<dd><p>Do not generate code using features specific to the AM33 processor.  This
is the default.
</p>
</dd>
<dt><a id="index-mam33_002d2"></a><span><code class="code">-mam33-2</code><a class="copiable-link" href="#index-mam33_002d2"> &para;</a></span></dt>
<dd><p>Generate code using features specific to the AM33/2.0 processor.
</p>
</dd>
<dt><a id="index-mam34"></a><span><code class="code">-mam34</code><a class="copiable-link" href="#index-mam34"> &para;</a></span></dt>
<dd><p>Generate code using features specific to the AM34 processor.
</p>
</dd>
<dt><a id="index-mtune-11"></a><span><code class="code">-mtune=<var class="var">cpu-type</var></code><a class="copiable-link" href="#index-mtune-11"> &para;</a></span></dt>
<dd><p>Use the timing characteristics of the indicated CPU type when
scheduling instructions.  This does not change the targeted processor
type.  The CPU type must be one of &lsquo;<samp class="samp">mn10300</samp>&rsquo;, &lsquo;<samp class="samp">am33</samp>&rsquo;,
&lsquo;<samp class="samp">am33-2</samp>&rsquo; or &lsquo;<samp class="samp">am34</samp>&rsquo;.
</p>
</dd>
<dt><a id="index-mreturn_002dpointer_002don_002dd0"></a><span><code class="code">-mreturn-pointer-on-d0</code><a class="copiable-link" href="#index-mreturn_002dpointer_002don_002dd0"> &para;</a></span></dt>
<dd><p>When generating a function that returns a pointer, return the pointer
in both <code class="code">a0</code> and <code class="code">d0</code>.  Otherwise, the pointer is returned
only in <code class="code">a0</code>, and attempts to call such functions without a prototype
result in errors.  Note that this option is on by default; use
<samp class="option">-mno-return-pointer-on-d0</samp> to disable it.
</p>
</dd>
<dt><a id="index-mno_002dcrt0"></a><span><code class="code">-mno-crt0</code><a class="copiable-link" href="#index-mno_002dcrt0"> &para;</a></span></dt>
<dd><p>Do not link in the C run-time initialization object file.
</p>
</dd>
<dt><a id="index-mrelax-2"></a><span><code class="code">-mrelax</code><a class="copiable-link" href="#index-mrelax-2"> &para;</a></span></dt>
<dd><p>Indicate to the linker that it should perform a relaxation optimization pass
to shorten branches, calls and absolute memory addresses.  This option only
has an effect when used on the command line for the final link step.
</p>
<p>This option makes symbolic debugging impossible.
</p>
</dd>
<dt><a id="index-mliw"></a><span><code class="code">-mliw</code><a class="copiable-link" href="#index-mliw"> &para;</a></span></dt>
<dd><p>Allow the compiler to generate <em class="emph">Long Instruction Word</em>
instructions if the target is the &lsquo;<samp class="samp">AM33</samp>&rsquo; or later.  This is the
default.  This option defines the preprocessor macro <code class="code">__LIW__</code>.
</p>
</dd>
<dt><a id="index-mno_002dliw"></a><span><code class="code">-mno-liw</code><a class="copiable-link" href="#index-mno_002dliw"> &para;</a></span></dt>
<dd><p>Do not allow the compiler to generate <em class="emph">Long Instruction Word</em>
instructions.  This option defines the preprocessor macro
<code class="code">__NO_LIW__</code>.
</p>
</dd>
<dt><a id="index-msetlb"></a><span><code class="code">-msetlb</code><a class="copiable-link" href="#index-msetlb"> &para;</a></span></dt>
<dd><p>Allow the compiler to generate the <em class="emph">SETLB</em> and <em class="emph">Lcc</em>
instructions if the target is the &lsquo;<samp class="samp">AM33</samp>&rsquo; or later.  This is the
default.  This option defines the preprocessor macro <code class="code">__SETLB__</code>.
</p>
</dd>
<dt><a id="index-mno_002dsetlb"></a><span><code class="code">-mno-setlb</code><a class="copiable-link" href="#index-mno_002dsetlb"> &para;</a></span></dt>
<dd><p>Do not allow the compiler to generate <em class="emph">SETLB</em> or <em class="emph">Lcc</em>
instructions.  This option defines the preprocessor macro
<code class="code">__NO_SETLB__</code>.
</p>
</dd>
</dl>

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